In view of the damage problem of fully grouted glass-fiber-reinforced plastic (GFRP) rock bolt under the blast dynamic load, a new dynamic response model of fully grouted GFRP rock bolt has been established on the basis of structural dynamics and exploding spherical wave theory. According to support parameters and monitoring blasting vibration data of fully grouted GFRP rock bolt from the Jinshandian Iron Ore Mine, the axial stress of rock bolt under the blast dynamic load has been calculated and analyzed, the characteristics and distribution of shear stress changing with time has been concluded, the influence of the distance between explosion source, the single maximum priming charge and the elasticity of surrounding rocks on the dynamic response of bolt have been studied. The results have shown that under the blast dynamic load, the maximum values of axial stress and shear stress of the rock bolt increase rapidly with the increase of the single maximum priming charge, change in sinusoidal form, and decrease over time, while they decrease rapidly with the increase of the blasting distance. The range of stress effect is mainly concentrated in the anchorage section near the rock bolt. This range increases with the increase of peak stress band the decrease of elasticity modulus of surrounding rock, and the maximum of shear stress gradually moves deeply into the anchorage section. To sum up, in terms of fully grouted glass-fiber-reinforced plastic rock bolt, under the blast dynamic load, the rupture failure of its tail or shear failure of the contact surface between rock bolt and mortar are related to the properties of surrounding rock. © 2020, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
